/*
 * Copyright 2017 StreamSets Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.streamsets.pipeline.api.ext;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * API for global references in Data Collector
 */
public class DataCollectorServices {
  private static final Map<String, Object> globals = new ConcurrentHashMap<>();
  private static final DataCollectorServices instance = new DataCollectorServices();

  private DataCollectorServices() {}

  public static DataCollectorServices instance() {
    return instance;
  }

  @SuppressWarnings("unchecked")
  public <T> T get(String key) {
    return (T) globals.get(key);
  }

  @SuppressWarnings("unchecked")
  public <T> T put(String key, Object ref) {
    return (T) globals.put(key, ref);
  }
}
